Steam boiler



April 9, 1935. o. GUNTHER STEAM BOILER Filed April 29, 1953 'Patented Apr. 9, 1935 A. 1,997,215

UNITED STATES PATENT omen};

STEAM BOILER Otto Giinther, Esslingen-on -the-Neckar, Germany, assignor to Maschinenfabrik Esslingen, Esslingen-on-the-Neckar, Germany Application April 29; 1933,.Serial No. 668,509

a In Germany December 18,1930

. v V 4 Claims, (01,122-235) V g g g This invention relates to improvements in the in the individual tubes forming the support strucdesign of steam boilers for motive power, f. i.railture. v cars, steam buses, small locomotives, etc. in which Further and other objects of h p e en i the fire box issubstantially built of steamgenventionwill be hereinafter set forth in the ac- 5 crating and Water carrying tubes. companying specification and. claims and shown 5 An object of this invention resides in the proin thedraw g w by W y of illustration, ShOWS vision of a new and improved water-tube boiler what I now consider to be a preferred embodiment 7 design in which the heat is substantiallytransof the invention. e

mitted by radiation to tubes lining the fire box, In the drawing: 5 a

10 and onlya comparatively small part of the heat Fig. 1 is a cross-sectional view of the boiler with 10 is transmitted by convection. the tubes forming the sidewall partly broken An object of this invention resides in the proaway. I vision of awater-tube boiler having such arrange- Fig. 2 is a vertical sectional view along line ment of the water and steam carrying tubes as AB of Fig. 1 with the tubes forming the rear to assure a'maximum of heat transfer in a very wall of the fire box partly broken away. I 15 small space. a Fig. 3 is a vertical sectional view along line An object of this invention resides in the proe CD of Fig. 1 with the frontbrick work broken visionof an improved water-tube boiler design away. wherein the steam drums are supported by down While the invention is susceptible of various 7 comer tubes. 7 g Y modifications and alternative constructions; -I- so An important object of this invention resides have shown in the drawing and will hereinvdein the provision of a water-tube steam, boiler conscribe in detail the pref red embodiment, t sisting of a fire boxsubstantially built of-heat, it is to be understood that I do not thereby inabsorbing tubes, convection tubes and water and tend to limit theinvention to the specific form steam drums arranged so that the steam drums disclosed but intend to cover all modifications 25 are supported by down comer tubes and said down and alternative constructions falling within the comer tubes are connected to the fire box ring spirit and scope of the invention; as expressed which supports the whole boiler. v in'the appended claims.

An object of the present invention resides in Ref rrin t th x mp a y embodiment f the provision of an improved water-tube boiler the inventiondes t the furnace the ceil- 3o for use in motivepower plants consisting of steam i g of Which is formed by the brickarch The and water carrying tubes and drums, arranged sorear wall of the furnace is formed substantially that the drums have no independent connection by t e Wa er tubes 4 W ich C nnect the fi e bOX with the car and can move freely under the inring 3 with the drum 5. As can beseenon Fig. 1 'fiuence of heat expansion conditions and the viof the drawing, t e :upp Parts Of the tubes 4 brations of the car and the forces due to inertia hav a b w- Configuration. The drum is when the car is accelerated or slowedrup. connected to the drum 1 by the tubes 6 and is An object of the present invention is the prorigidly e t d W and DD y t e fi vision of a water-tube boiler consisting of drums bOX ring 3 by a Of thedowncemer tubes 3, 9, 40 and heat absorbing tubes for use in rail cars, 10- and tubes 4 a 9 of the tubes 49 comotives and the like arranged so that the drums substajntlauy; form the chamber 1 are supported by water carrying tubes having clrcula'tmn through e e of fi p comparatively equal temperatures at an output which may be called the radiation boiler, is mconditions so that all parts can freely expand .dependent from t through the other parts 4 and M of the b01161; The preheated feed water and. contract and no stresses can be applied to the Structure and particularly the joints by heat circulates from the drum l5 via the overflow I6 a into the drum 5 and therefrom through the downpansion conditions and vibrations 01. the car procomer tubes 8 9 I into the drum 1 and into pened y the steajmgenerftted thebollerthe fire box ring 3; from fire box ring 3 it passes 50 oblect P thls mventlon res1des m the through the heat absorbing. tubes 4 and 6 respec- 50 I VlSlOn of an improved water-tube boiler for mO- tively i hi h it is partly evaporated or retive power plants as outlined in the foregoing obturned t th drum 5 The drum {5 t r iect and w e eb the d w comer t bes support with tube n and the drum l8 forms a further ing the heavy drums are so arranged that only boiler unit l3 also having an independent circu- 65 tensile and compression stresses are created withlation. The water which is preheated in the1 boiler unit It enters through the overflow l9, the feed valve 20 and the strainer 2| the drum [5 and circulates from this drum through the front tubes Ha, the drum I8 and the rear tubes l'lb back into drum IS. The boiler unit [4 with the collecting drum 22, the drums 23, 24 and 25 and the Water tubes 26, 2] and 28 has three independent circulating cycles. 7 r J The downcomer tubes 8, 9, and H are outside and protected from heat transmission by radiation or convection. They are arranged as a triangle, the'base of which is formed by box ring 3, and support the upper drums 5 and V I5 which latter rests on the drum '5 by waygof the shoes 34; Cross pipes l0 interconnectingjthe downcomer tubes may be provided and arranged substantially parallel to that side of the firebox ring 3, which forms the base of the triangle. Such. cross pipes considerably stiffen the triangle structure and practically completely pre vent bending 'of 'the downcomertubes under-the influence of the weight of the boiler. Since the fire box ring is directly connected to the ,car frame, the drums 5 and I5 and the'boiler unit l2 connected thereto are also directly supported by this-frame. The horse-like triangle construction of. the'downcomer, and support tubes 8, 9,, l0 and l I assures that only tensile and compresture, thetubes 4 and'B and the drum 5, and heat stresses are preventedin the system at practically all operating and load conditions. 7 I 1 To complete the description of the embodimerit of my invention shown in the drawing, '29

is a feed water preheater which may be heated by exhaust steam from the engine, 3S'i's the deed tube connecting the feed heater with, drum 23of the first boiler unit i4, 35 is a superheater, j32 is an ash door, 33 is an 'asn pit. 7 I

What I claim is: V a l. Atubularsteam generator having a fire-box built substantially of curved and flexible heat absorbing tubes,- a steam drum, and a header located substantially at the bottom of and. surrounding said 'fire box, a plurality bf said'heat absorbing tubes connecting said steam drum and said header, and straight, rigid-downcomer tubes connected pairwise to said header and to both ends of said'steam drum and-(spreading apart and forming, together with said header,-a triangled support structure'fcr said drum which is located at the upper corner of the triangle,

said support structure definitely taking off all load from said heat absorbing tubes.

2. A tubular steam generator for vehicles having a fire box, a steam drum located substantially over said fire box and a header located substantially at the bottom of and surrounding said fire box, a plurality cfvstraightdowncomer tubes connected to said header and said steam drum, said downcomer tubes being located substantially in planes parallel to the direction of the movement of said vehicle, the downcomer tubes located in one plane spreading apart and forming, together with said header, a horse-like support structure for said steam drum adapted to absorbthe forces of inertia occurring during the acceleration and slowing up of the vehicle, and water carrying tubes also located in said planes parallel to the direction of movement of the vehicle and interconnecting said downcomer tubes located in 'thesame plane and increasing thelrigidity of said support structure.

3.:A zztubular. steam generator having a fire box, asteam drumlocated substantially over said fire box and a header located substantially at the'bottom of and surrounding said fire box, a plurality of curved and fiexible heat absorbing tubes connecting said steam drum and said header, a plurality of pairs of straight, rigid downcomer tubes connected to said header'and said steam drum, said downcome'r tubes ofeach of 'saidpairs being located substantially in parallelplancs and being spread apart "to form, together with said header, the exclusive supporting structure for said steam drum and'adapted to definitely maintain the distance between said header and said steam drum and the location of said steam drum with respect to said'header.

In vehicles,ia tubular-steam generator having a firebox, headers locatedsubstantially at the bottom of and surrounding said fire box, a

steam drum, a plurality of curved and flexible heat absorbing tubes connecting said steam drum and saidheader, a plurality of pairs of straight downcomer tubes connecting saidjheaders and said steam drum" and-exclusively supporting said steam drum, all of said downcomer tubes being located substantially in planes parallel to the directionof movement of said vehicle, each pair of said downcomer tubes and said headers forming a pointed triangle, the point of which is constituted by said steam drum, the base of which is constituted by said headers, said triangle-being adapted to absorb the forces of inertia occurring during the acceleration and slowing up of the vehicle and to definitely maintain the distance between said header and said steam drum and the location of said steam drumwith respect to said-header.

'o'r'ro GI'JNTHER. 

